The Big Bang Theory, Season 1

Howard:
Sheldon, if you were a robot, and I knew and you didn't, would you want me to tell you?

Sheldon:
That depends. When I learn that I'm a robot, will I be able to handle it?

Howard:
Maybe, although the history of science fiction is not on your side.

Sheldon:
Uh, let me ask you this: when I learn that I'm a robot, would I be bound by Asimov's Three Laws of Robotics?

Raj:
You might be bound by them right now.

Howard:
That's true. Have you ever harmed a human being, or, through inaction, allowed a human being to come to harm?

Sheldon:
Of course not.

Raj:
Have you ever harmed yourself or allowed yourself to be harmed except in cases where a human being would've been endangered?

Sheldon:
Well, no.

Howard:
I smell robot.